LTCC系统用低温烧结SrFe12O19铁氧体性能的改善研究

Improved Characteristics of Low-temperature Sintered SrFe12O19 Ferrites for Use in LTCC System Applications

摘要:

本文采用固相法制备M型六角锶铁氧体(SrFe12O19)材料，利用Bi2O3作为烧结助剂以改善材料的低温烧结特性，系统研究了材料的晶体结构、电学性能和磁学性能。结果表明：当烧结温度降低至900 癈时可以获得单相的SrFe12O19铁氧体材料。Bi2O3的添加对低温烧结材料的电学性能和磁学性能影响显著，可以提高材料的电阻率ρ、饱和磁化强度Ms、內禀矫顽力Hci和磁晶各向异性场Ha。低温烧结材料的ρ、Ms、Hci和Ha分别可以达到0.42?08 Ω?cm、285.6 kA?m-1、347.3 kA?m-1和1546.6 kA?m-1，在非互易LTCC（低温共烧陶瓷）铁氧体器件领域具有重要的应用前景。

Abstract:

In order to improve the sintering characteristics of the low-temperature sintered M-type hexagonal strontium ferrites (SrFe12O19) prepared by solid phase method, the Bi2O3 additive was used as sintering aid, and the crystal structure, electrical properties, and magnetic properties of the ferrites were investigated. The results show that the single phase structural SrFe12O19 ferrites can be obtained even with a low sintering temperature of 900 癈. The Bi2O3 additive is found to possess a significant effect on the electrical properties and magnetic properties for the ferrites sintered at low temperatures, typically leading to enhanced resistivity ρ, saturation magnetization Ms, intrinsic coercivity Hci, and magnetic anisotropy field Ha. It is suggested that the low-temperature sintered SrFe12O19 ferrites with ρ of 0.42?08 Ω?cm, Ms of 285.6 kA?m-1, Hci of 347.3 kA?m-1, and Ha of 1546.6 kA?m-1 provide an important potential application in nonreciprocal LTCC (low temperature co-fired ceramics) ferrite devices.